Communications: electrical – Systems – Call station
Patent
1974-06-28
1976-06-29
Caldwell, John W.
Communications: electrical
Systems
Call station
340228R, 250554, G08B 2100
Patent
active
039672557
ABSTRACT:
A flame detection system comprising two light responsive photovoltaic photocell sensors in combination with corresponding light filters, a photovoltaic sensing amplifier, a control amplifier, and a power source. The photocell/filter combinations are responsive to spectral energy in two different regions of the spectrum, said regions being such that illumination from a hydrocarbon flame causes a reversal in voltage polarity of the signal from the pair of photovoltaic photocells. The photovoltaic photocells are serially connected in voltage opposition and the voltage produced by the combination is applied as an input coupled to the sensing amplifier. The latter is arranged and configured to respond to a selected voltage polarity generated by the photovoltaic combination, when illuminated by a hydrocarbon flame, by providing a control signal to the control amplifier. The control amplifier is typically coupled to a relay and/or solenoid valve which controls the turn-on of a fire alarm and/or extinguishing means. Whenever the control amplifier receives a control signal (indicative of the presence of a hydrocarbon flame), it activates the relay and/or solenoid valve and, thereby, causes the alarm and/or extinguishing means to turn on.
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Oliver Stuart M.
Parsons Sanford J.
Proud, Jr. Ralph A.
Caldwell John W.
Park Theodore Scott
Q.sup.2 Corporation
The Delphian Foundation
Wannisky William M.
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